(Tcl) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

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load ./chilkat.dll

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

set success 1

# This example uses a previously obtained access token having permission for the 
# Google Drive scope.

# The access token (and refresh token) was previously saved to a JSON file with this format:
# See Get Google Drive OAuth2 Access Token

# {
#   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
#   "expires_in": 3600,
#   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
#   "scope": "https://www.googleapis.com/auth/drive",
#   "token_type": "Bearer"
# }

set json [new_CkJsonObject]

set tokenFilePath "qa_data/tokens/googleDrive.json"
CkJsonObject_LoadFile $json $tokenFilePath

set oauth2 [new_CkOAuth2]

CkOAuth2_put_AccessToken $oauth2 [CkJsonObject_stringOf $json "access_token"]
CkOAuth2_put_RefreshToken $oauth2 [CkJsonObject_stringOf $json "refresh_token"]

CkOAuth2_put_AuthorizationEndpoint $oauth2 "https://accounts.google.com/o/oauth2/v2/auth"
CkOAuth2_put_TokenEndpoint $oauth2 "https://www.googleapis.com/oauth2/v4/token"

#  Replace these with actual values.
CkOAuth2_put_ClientId $oauth2 "GOOGLE-CLIENT-ID"
CkOAuth2_put_ClientSecret $oauth2 "GOOGLE-CLIENT-SECRET"
CkOAuth2_put_Scope $oauth2 "https://www.googleapis.com/auth/drive"

# Use OAuth2 to refresh the access token.
set success [CkOAuth2_RefreshAccessToken $oauth2]
if {$success != 1} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkJsonObject $json
    delete_CkOAuth2 $oauth2
    exit
}

puts [CkOAuth2_accessTokenResponse $oauth2]

# Save the new access token to our JSON file (so we can refresh it again when needed).
CkJsonObject_UpdateString $json "access_token" [CkOAuth2_accessToken $oauth2]

set fac [new_CkFileAccess]

CkFileAccess_WriteEntireTextFile $fac $tokenFilePath [CkJsonObject_emit $json] "utf-8" 0

puts "Access Token Refreshed!"

delete_CkJsonObject $json
delete_CkOAuth2 $oauth2
delete_CkFileAccess $fac